[MacPorts] #62049: mame: @0.227 build failure on macOS 10.13 and Xcode 9.4.1, due to aligned_alloc

[MacPorts]

#62049: mame: @0.227 build failure on macOS 10.13 and Xcode 9.4.1, due to
aligned_alloc
---------------------+----------------------
 Reporter:  mascguy  |      Owner:  mascguy
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  mame
---------------------+----------------------
 Mame 0.227 is failing to build on our infrastructure, with the combination
 of macOS 10.13 and Xcode 9.4.1. That's due to the use of C++
 aligned_alloc.

 However, builds succeed on macOS 10.13, when using Xcode 10.1.

 Note that Mame is utilize macports-clang-9 for compilation, which supports
 aligned_alloc. So I suspect the macOS SDK provided by Xcode is the
 culprit.

 Presently investigating whether there is a fix for Xcode 9.4.1.

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Ticket URL: <https://trac.macports.org/ticket/62049>
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